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Two female suicide bombers detonated their vests during morning rush hour at metro stations in Moscow, killing 37 people and wounding 65 more. The attack was carried out by the Caucasus Emirate's black widows, and was foreshadowed by the leader of the terror group in a statement in February.

The first suicide bomber detonated at the Lubyanka metro station at 7:52 a.m. local time, killing 24 people, according to RIA Novosti. The Lubyanka station is near the headquarters of the Federal Security Service (FSB), the successor of the notorious KGB.

The second blast took place about 40 minutes later, at the Park Kultury station, which is near the Kremlin, killing 13 people.

The FSB said that an estimated four kilograms of explosives was used in the first suicide attack and 1.5 kilograms was used in the second.

"At present the overall number of the dead as a result of the explosions at the Park Kultury and Lubyanka metro stations is 37, and another 65 were wounded," Irina Adrianova, the spokeswomen for the Ministry for Emergency Situations told ITAR-TASS.

The FSB believes the attacks were carried out by the 'black widows,' members of the Caucasus Emirate's female suicide bomber cadre. The chief of the FSB said the heads of two women have been recovered at the blast sites. The Black Widows are typically wives or daughters of family members killed during the wars against the Russians in Chechnya.